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init: support apkovl=<localdev>:<fstype>:pathto/host.apkovl.tar.gz

Add support for the following formats for apkovl boot option:

 apkovl=sda1:ext4:/mydir/host.apkovl.tar.gz
 apkovl=sda1:/mydir/host.apkovl.tar.gz
 apkovl=/mydir/host.alpkovl.tar.gz

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -52,6 +52,11 @@

 	local ovl

 	local lines

+	if [ -n "$APKOVL" ]; then

+		[ -f "$mnt/$APKOVL" ] && echo "$mnt/$APKOVL"

+		return

+	fi

+

 	# look for apkovl's on mounted media

 	ovl=$( ls -1 "$mnt"/*.apkovl.tar.gz* 2>/dev/null ) || return 1

 	lines=$(echo "$ovl" | wc -l)

@@ -434,6 +439,19 @@

 case "$KOPT_apkovl" in

 	http://*|https://|ftp://*)

 		OVL_DEV="$KOPT_apkovl";;

+	*:*:*)	# apkovl=sda1:ext4:/subdir/host.apkovl.tar.gz

+		OVL_DEV="${KOPT_apkovl%%:*}"

+		OVL_DEV_FS="${KOPT_apkovl%:*}"

+		OVL_DEV_FS="${OVL_DEV_FS#*:}"

+		APKOVL="${KOPT_apkovl##*:}"

+		;;

+	*:*)	# apkovl=sda1:/subdir/host.apkovl.tar.gz

+		OVL_DEV=${KOPT_apkovl%%:*}

+		APKOVL=${KOPT_apkovl##*:}

+		;;

+	*)	# apkovl=subdir/host.apkovl.tar.gz

+		APKOVL="${KOPT_apkovl}"

+		;;

 esac

 case "$ALPINE_DEV" in